class student:
    ID = None
    name = None
    age = None

    def sayHi(self):
        print(f"Hi,i'm {self.name}")

    def saySentence(self, sentence):
        print(f"{sentence}")


student1 = student()
student1.ID = "202317200100"
student1.name = "Jack"
student1.age = 18
print(student1.ID, student1.name, student1.age)
student1.sayHi()
student1.saySentence("hello world")
